this指针的使用场景

this一般运用场景：

1.位于函数中，谁调用指向谁

var make = "Mclaren";

var model = "720s"
function fullName() {
console.log(this.make + " " + this.model);
}
var car = {
make: "Lamborghini",
model: "Huracán",
fullName: function () {
console.log(this.make + " " + this.model);
}
}
car.fullName(); // Lmborghini Huracán
window.fullName(); // Mclaren 720S
fullName(); // Mclaren 720S

 

2.事件调用，指向调用元素

<button onclick="this.style.display='none'">
Remove Me!
</button>

 

3.方法中调用

var car = {
make: "Lamborghini",
model: "Huracán",
fullName: function () {
console.log(this.make + " " + this.model);
console.log(car.make + " " + car.model);
}
}
car.fullName();

 

4.直接使用this,则默认全局